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#ifndef _FORMAT_H
#define _FORMAT_H
#include "xpath.h"
namespace ledger {
class format_t
{
public:
struct element_t
{
bool align_left;
short min_width;
short max_width;
enum kind_t { UNKNOWN, TEXT, COLUMN, XPATH, GROUP } kind;
union {
string * chars;
xml::xpath_t * xpath;
format_t * format;
};
element_t()
: align_left(false), min_width(-1), max_width(-1),
kind(UNKNOWN), chars(NULL) {
TRACE_CTOR(element_t, "");
}
~element_t() {
TRACE_DTOR(element_t);
switch (kind) {
case TEXT:
checked_delete(chars);
break;
case XPATH:
checked_delete(xpath);
break;
case GROUP:
checked_delete(format);
break;
default:
assert(! chars);
break;
}
}
private:
element_t(const element_t& other);
};
struct element_formatter_t {
virtual ~element_formatter_t() {}
virtual int operator()(std::ostream& out, element_t * element,
xml::node_t * context, int column) const;
};
string format_string;
std::list<element_t *> elements;
private:
format_t(const format_t&);
public:
format_t() {
TRACE_CTOR(format_t, "");
}
format_t(const string& fmt) {
TRACE_CTOR(format_t, "const string&");
parse(fmt);
}
void clear_elements() {
for (std::list<element_t *>::iterator i = elements.begin();
i != elements.end();
i++)
checked_delete(*i);
elements.clear();
}
virtual ~format_t() {
TRACE_DTOR(format_t);
clear_elements();
}
void parse(const string& fmt);
void compile(const string& fmt, xml::node_t * context = NULL) {
parse(fmt);
compile(context);
}
void compile(xml::node_t * context = NULL);
int format(std::ostream& out, xml::node_t * context = NULL,
int column = 0, const element_formatter_t& formatter =
element_formatter_t()) const;
operator bool() const {
return ! format_string.empty();
}
};
DECLARE_EXCEPTION(format_error);
} // namespace ledger
#endif // _FORMAT_H
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